Get difference of seconds beetween two dateTime

Question

How can I calculate the difference in seconds between two dates?

I have this:

LocalDateTime now = LocalDateTime.now(); // current date and time
LocalDateTime midnight = now.toLocalDate().atStartOfDay().plusDays(1); //midnight

In this case the time is: now 2017-09-14T09:49:25.316 midnight 2017-09-15T00:00

How i calculate int second = ...?

And the result, in this case, that i want return is 51035

How i can do?

UPGRADE SOLVED

I try this:

DateTime now = DateTime.now();
DateTime midnight = now.withTimeAtStartOfDay().plusDays(1);
Seconds seconds = Seconds.secondsBetween(now, midnight);
int diff = seconds.getSeconds();

Now return the difference beetween the date in seconds in integer variable.

Thank all user for response.

Nicola Ambrosetti · Accepted Answer · 2017-09-14T08:48:58.997

8

int seconds = (int) ChronoUnit.SECONDS.between(now, midnight);

edited Sep 14 '17 at 08:48

answered Sep 14 '17 at 08:02

Nicola Ambrosetti

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Clean solution. Actually cleaner then mine. Please notice Java 8 is needed to use the ChronoUnit class – Mathias G. Sep 14 '17 at 08:10
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@MathiasGhys `LocalDateTime` is already part of Java 8. – Luciano van der Veekens Sep 14 '17 at 08:10
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`between()` returns a `long`. If you want to assign to an `int` (which in this case is reasonable), I recommend a bounds check before casting. – Ole V.V. Sep 14 '17 at 08:21

Luciano van der Veekens · Answer 2 · 2017-09-14T08:09:46.887

0

Convert them to seconds since Epoch and compare differences.

LocalDateTime now = LocalDateTime.now();
LocalDateTime tomorrowMidnight = now.toLocalDate().atStartOfDay().plusDays(1);

ZoneId zone = ZoneId.systemDefault();
long nowInSeconds = now.atZone(zone).toEpochSecond();
long tomorrowMidnightInSeconds = tomorrowMidnight.atZone(zone).toEpochSecond();
System.out.println(tomorrowMidnightInSeconds - nowInSeconds);

edited Sep 14 '17 at 08:09

answered Sep 14 '17 at 08:02

Luciano van der Veekens

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score 0 · Answer 3 · answered Sep 14 '17 at 08:04

I would do this through epochTime:

ZoneId zoneId = ZoneId.systemDefault();

LocalDateTime now = ...;
long epochInSecondsNow = now.atZone(zoneId).toEpochSecond();

LocalDateTime midnight = ...;
long epochInSecondsMidnight = midnight.atZone(zoneId).toEpochSecond();

and then calculate the difference:

long result = (epochInSecondsMidnight - epochInSecondsNow)

Get difference of seconds beetween two dateTime

3 Answers3